diff -r aa8621b58cd7 -r 38b051dea6b1 src/cx/string.h
--- a/src/cx/string.h	Mon Dec 22 00:20:41 2025 +0100
+++ b/src/cx/string.h	Mon Dec 22 15:28:07 2025 +0100
@@ -1006,6 +1006,27 @@
  */
 #define cx_strcasesuffix(string, suffix) cx_strcasesuffix_(cx_strcast(string), cx_strcast(suffix))
 
+
+/**
+ * Replaces a string with another string.
+ *
+ * Internal function - do not use.
+ *
+ * @param allocator
+ * @param str
+ * @param search
+ * @param replacement
+ * @param replmax
+ * @return
+ * @see cx_strreplace_a()
+ * @see cx_strreplace()
+ * @see cx_strreplacen_a()
+ * @see cx_strreplacen()
+ */
+cx_attr_nodiscard cx_attr_nonnull
+CX_EXPORT cxmutstr cx_strreplace_(const CxAllocator *allocator,
+        cxstring str, cxstring search, cxstring replacement, size_t replmax);
+
 /**
  * Replaces a string with another string.
  *
@@ -1017,16 +1038,15 @@
  * If allocation fails, or the input string is empty,
  * the returned string will be empty.
  *
- * @param allocator the allocator to use
+ * @param allocator (@c CxAllocator*) the allocator to use
  * @param str the string where replacements should be applied
  * @param search the string to search for
  * @param replacement the replacement string
- * @param replmax maximum number of replacements
- * @return the resulting string after applying the replacements
+ * @param replmax (@c size_t) maximum number of replacements
+ * @return (@c cxmutstr) the resulting string after applying the replacements
  */
-cx_attr_nodiscard cx_attr_nonnull
-CX_EXPORT cxmutstr cx_strreplacen_a(const CxAllocator *allocator,
-        cxstring str, cxstring search, cxstring replacement, size_t replmax);
+#define cx_strreplacen_a(allocator, str, search, replacement, replmax) \
+        cx_strreplace_(allocator, cx_strcast(str), cx_strcast(search), cx_strcast(replacement), replmax)
 
 /**
  * Replaces a string with another string.
@@ -1039,9 +1059,9 @@
  * If allocation fails, or the input string is empty,
  * the returned string will be empty.
  *
- * @param str (@c cxstring) the string where replacements should be applied
- * @param search (@c cxstring) the string to search for
- * @param replacement (@c cxstring) the replacement string
+ * @param str the string where replacements should be applied
+ * @param search the string to search for
+ * @param replacement the replacement string
  * @param replmax (@c size_t) maximum number of replacements
  * @return (@c cxmutstr) the resulting string after applying the replacements
  */
@@ -1058,9 +1078,9 @@
  * the returned string will be empty.
  *
  * @param allocator (@c CxAllocator*) the allocator to use
- * @param str (@c cxstring) the string where replacements should be applied
- * @param search (@c cxstring) the string to search for
- * @param replacement (@c cxstring) the replacement string
+ * @param str the string where replacements should be applied
+ * @param search the string to search for
+ * @param replacement the replacement string
  * @return (@c cxmutstr) the resulting string after applying the replacements
  */
 #define cx_strreplace_a(allocator, str, search, replacement) \
@@ -1075,9 +1095,9 @@
  * If allocation fails, or the input string is empty,
  * the returned string will be empty.
  *
- * @param str (@c cxstring) the string where replacements should be applied
- * @param search (@c cxstring) the string to search for
- * @param replacement (@c cxstring) the replacement string
+ * @param str the string where replacements should be applied
+ * @param search the string to search for
+ * @param replacement the replacement string
  * @return (@c cxmutstr) the resulting string after applying the replacements
  */
 #define cx_strreplace(str, search, replacement) \